Abstract: An apparatus for treating waste water includes a revolvable disc assembly partially submerged in a tank containing waste water. The disc assembly includes a plurality of similar lightweight nonmetallic discs, each disc comprising a plurality of similar disc sections. Adjacent discs of the disc assembly engage each other and each disc has a surface configuration that cooperates with the surface configuration of the next adjacent disc to define a plurality of concentric passages between the discs. A plurality of elongate rigid rods secure the disc through yieldable joints to a pair of circular end support members and to circular intermediate support members.

Abstract: A schnabel-type railroad car adapted to carry very large loads incorporating articulated end units having a massive hinge at a reduced pivot location so that the weight of the car can be carried at a central location on the trucks while still pivoting about a lesser radius to help negotiate tight turns. Special hydraulic systems permit the car to be raised and lowered and also shifted laterally to provide additional roadbed clearance.

Abstract: A flat car hand brake system in which a vertical wheel, high powered hand brake is positioned horizontally below the deck to provide load clearance. An adjustable chain takeup system moves the idle portion of the brake chain at exactly the same rate as the loaded or pulled portion of the chain to prevent any slack which would cause fouling.